يَكْتُبُ — لَنْ يَكْتُبَ
Yaktubu is indicative; lan yaktuba is subjunctive because the subjunctive governor lan precedes it.
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With Lan: The Governing Cause Changes
The Indicative Imperfect and Its Governor
يَكْتُبُ — لَنْ يَكْتُبَ
Yaktubu is indicative; lan yaktuba is subjunctive because the subjunctive governor lan precedes it.